I see them on craigsList relatively often, usually pretty inexpensive. Maybe book-face marketplace too. Remember the mounts for the narrow & wide frames differ. I believe the blades themselves are essentially the same.
I've got one I put on my #70 a couple winters, I repainted it but the blade itself is black epoxy, not IH #935, but it does have a new IH decal. BUT Mapquest says it's 1001 miles from Me to You.
I will say I was really impressed how well it scraped my concrete driveway right down to bare concrete. I wanted something to clean up the little 1/2" to 1" or so snows, but by the time I scraped up half my driveway the #70 was spinning out anyhow, so I've kept using my Super H and 80 inch wide blade. I'd like to find another set or two of rear wheel weights for it. I've got 3 sets on the M but SON says I can't borrow them, and they're Mine!